Patio umbrella



FIG. 1 is a perspective view of a patio umbrella;

FIG. 2 is a rear view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a side view thereof starting to retract;

FIG. 7 is a side view thereof continuing to retract; and,

FIG. 8 is a side view thereof fully retracted. 

I claim the ornamental design for a patio umbrella, as shown and described. 